Grinding machine



SeP 1932. F. s. HAAS ET AL 1,877,505

GRINDING MACHINE Filed March 8, I930 2 Sheets-Sheet l Se t. 13, 1932. F.s. HAAS VETYALI GRINDING MACHINE FiledMarch' 8, 1930 2 Sheets-Sheet 2not: or one 25 ent invention should be readily understood 45 66 ofFigure 5.

Patented Sept. 13, 1 932 rmannmcx anus Annamaria!) aixmmqsorCINCIENNATIQOHIO, assrenoas'ro I m cmcn'nnn Application n eajil amh 8;:

p This invention relates to improvements in machine tools andes'peciallyto improvements in grinding machines; I

An object oftheinvention is to provide improved means for dressing theactive surface of a rotating too'l'of a machine tool organization.

Another object of the/invention is the pro- 1 vision of improved meansthat maybe read i1; positioned for operation on'the active face 0 agrinding wheel to condition same to perform either-a rough grindingoperation 'or w a finish grinding operation on a work piece. A furtherob ect of the invention is the provision ofa machine tool forsimultaneous- 'ly operatin ona plurality of surfaces of a stepped orormed-work piece including improved: tool dressin -means for dressing ortrueing each'step o the rotating tool.

A still further object of the invention is to provideanimprovedmechanism for conditioning that portion of a grinding wheel utilized togrind or finishl'a' radius or fillet.

Other-objectsand advanta es of the presby reference to the followingspecifications considered in conjunction with the accompanying d'rawingsforming-a part thereof and it is to be understood-that any modifica-'tions may be made in the exact structural details without departing fromor exceeding the spirit of the invention.

Figure 1 is a plan view of a grinding machine embodying-the improvementsof this invention. a a

r Figure 2 is a sectional view taken online. 1 22 of Figural. r

Figure 3 is a sectional view takenon line 33 of Figure 1. Figures; is asectional view taken on line 4---4.of Figure 2. Figure 5 is a sectionalview taken online .v 5-5 of Figure 1.. i 7 Figure 6 is a sectional viewtaken on line Figure7 is a fragmentary plan view of the radius trueingtool disclosed in Figure 5.

Throughout the several views of the drawings similar referencecharacters. are employed todenote same or similar parts.

GBDIDEBS 'mconroaA'rEn, or cmormurromo, A oonroaa reap. semi so.434,400; v

A device embodying this invention may comprise abed or support 10 havingformed ciprocating work supporting table 13. The tale 13has securedthereon head stock 14 and tail stock 15 respectively supporting centers16 and 17 for the work piece 18 and thereon ways 11. and 12'for guidingthe representing s anie to'the grinding Wheel 19. v

The grinding wheel 19 is secured to a s indle journaled in bearingsQOslidably carriedby thebed 10. Y i

f Heretofore, it has been customary to mount 1 a trueing or dressingtool on some part or portionof'the reciprocable table 13 to dress ortrue the active surface of the grinding wheel'sothat said surface'canproperlyv grind and finishthe surface of work pieces. In

certainiclasses of work such as grinding the bearings and rollportmn'ofapressure roll 7 used with steel rolling mills or the like, it isdesirable to finish grind the bearings and only rough grind theremainder of the roll. This requires the substitution of trueing ordressing tools to correspondingly condition r thesurfa'ce of the wheel;since, to rough rind,"an open or less smooth grinding surace is usedwhlle to finlsh 'gr1nd a very smooth grinding surface is deslrable. To

obtain the former surface, a trueing tool-in r the nature of an abrasive"wheel or aRoss' dressing tool may be used while to obtain the latterfinish a diamond is generally employed. Another difliculty experienced.in

the past, has been the reconditionin of the various stepsofa steppedor'formed grinding wheel when the said wheel-was'e'mployed forsimultaneously grinding the plurality of surfaces of'a stepped work.piece or the like since for production grinding it isnece'ssary tomaintain a definite relatlon-between the 1 various faces or steps of thewheel. By this invention a plurality of dres'sing or trueing.

toolsare provided, one of which may be used for preparing the surface ofthe "grinding wheel for-rough grinding while the other may be; used forpreparing the said surface for finish rinding, or the tools maybe usedindividual y fordressing'the individual step faces of a formednorstepped wheel; Furw ther the tools are so related andadjusted one to theother to maintain the predetermined fixed relation between the steps andthe adjustment is made but once and that at the time the machine isbeing set up.

The active surface of the wheel is dressed by longitudinallyreciprocating the table 13,

to pass the trueing tool or tools carried thereby across the face of thewheel, as is well known in the art, and it is to be understood that asuitable-mechanism for reciprocating the table is included within bed10. T

The tail stock 15 comprises a housing 21 enclosing the longitudinalaxially shiftablesleeve 22 having secured therein the center 17. Securedto the spindle 22 by means of.

cap screws or thelike-23 is a flanged plate 24 having flanges 25extending therefromand surrounding a reduced portion 26 of the housing22. The flange is provided with a circular groove 27 inwhich retainingshoes 28 carried by revoluble ring member 29 are received to preventdisassociation thereof counter bore therein to receive a lug on therotated relative to a plate 24 for bringing- I into operative positionany one of a plurality of dressing or trueing tools carried thereby.

from the plate 24. ,The retaining shoes 28 are secured in place bylocking screws 30 that extend through the ring 29 and. having a saidshoes 28. This ring 29 isadapted to be To look the ring 29in its variousadjusted positions it is provided with a spring pressed plunger 31having an operating knob 32 cooperating with notches 33 and 34 formed inplate 24. i

As shown in the drawings the ring 29 supports two dressing ortrueingdevices, one a diamond 35 for, operation, on the large step 36 of wheel19 or for. conditioning the surface of a grinding wheelfor finishgrinding, for example, and the other a rotatable wheel 37, made ofsuitable abrasive material for operation on the surface of thesmallerstep 38 or forconditioning the surface of a grinding wheel for roughgrinding, for example,

it is to be understood that, if desired, anynumber of trueing ordressing tools may be mounted about the ring 29 with suitable additionalnotches such as 33 and 34 to lock the ring in the different positions.The diainond 35 is adjustable through a guide sleeve or the like 39 andsecured in position by set screw 40. Thef'diamond'point may be adjustedto bear the samerelation with respect to the active surface of thetrueing wheel 37 as the difference in radii of the large and small steps36 and 38,of grinding wheel 19.

I Bfy this construction the surfaces 36 and 38 he grinding wheel 19 maybe maintained in proper relation one to the'other for correspondinglysuccessively grinding the sur-' faces of a pluralityof work pieces sinceby merely withdrawing plunger 31, after one of the steps has been truedand rotating ring 29 the other trueing tool maybe brought into portionsthereof which fillet'is ground or finished simultaneously with thefinishing of the various portions of the work piece. To dress or truethe active surface of the fillet or corner 36a of the large step 36 ofthe grinding wheel 19; the followingmechanism is provid ed A housing orbracket 47 is secured by means of screws 48 or the like to the housingof the tailstock and is provided with an en-, larged sleeve .49. Lthrough the sleeve is a shaft 50 secured therein by set screws 60 andthe shaft supports on'opposite ends thereof theinner races ofanti-friction bearings 51 and 52 The outer races of these bearings arerespectively secured to and enclosed within the'sleeves 53 and 54 inturn secured in bores formed in arms 55 and 56 of the forked end 61 ofthe oscillatable member 57. The oscillatable member 57 has extendingtherefrom intermediate its ends an actuating handle or lever 58'andadjustably carries at its upperend a diamond 59. The diamond 59 issecured in a sleeve 62 adjustable through ailcollar '63 formed on theend of oscillatable member 57 and the sleeve may be secured-in its.adjust able positions by a set screw 64. To limit the oscillations ofthe member '57 through a definite arc the sleeve'49 is provided-fwith alug 65 through which an adjustable--'-abut-.

ment screw 66 extends for engagement-with one side of flange 67 integralwith the oscillatable members57 for limiting the oscillation inonedirection. The'other side of the flange 67 abuts with a secondadjustable abutment screw 68, carried by the bracket 47, for limitingthe oscillations in the other direction. The relationship of diamond 59to the other trueing tools carried by ring 29 is such that uponcompleting the redressing operation of surfaces 36 and 38 the lever orhandle 58 might be. actuated :to swing oscillatable member 57 about theaxis of shaft 52 to round u the corner 36a of surface '36.

- To ad ust and set the diamond 59 for con-- ditioning the corner of thewheel to grind a fillet of a predetermined size the 0scillat able member57 is provided with a-boss 69 having a finished face 7 0 formed thereoncooperating with a gauge 71 shown in Figure 2.

The face 70 is a known distance away from the axis of shaft 52, forexample, an inch and a half, and the-gauge 71 has a finished face 72that engages the said surface or face xtendingcentrally raw-,roa

70 and the gauge extends adjustable upward above the diamond 59. Nowif'the diamond 59 were adjusted so that its point engaged the i saidface 72, upon oscillation of the member 57 the corner 36a of wheel 19would be conditioned to grind a fillet having an inch and a half radius.To form and condition the said corner 36a to grind fillets of differentradii the gauge 71 is provided with a plural; ity of faces 73 above theface 72 which are stepped back a given amount and if the diamond pointwere brought into engagement with any one of them, the radius of thefillet would be as much less than the original radius as the particularface 7 3 being employed is offset from the face 72.

From the foregoing description it will be noted that a compact trueingstructure has been provided for successively and expeditiously trueingor dressing a plurality of surfaces on a grinding wheel and preparingsame for additional use without destroying the relationship between thevarious surfaces of the wheel. Also it will be noted that the face of agrinding wheel may be conditioned to perform a rough or a finishgrinding operation on a work piece.

WVhat is claimed is:

1; In a grinding machine the combination of a grinding wheel having aplurality of circumferential active surfaces, a work supporting tableadjacent the grinding wheel, a tailstock carried by the table, meanscarried by the tailstock for supporting a plurality of trueing tools onefor each face of the grinding wheel includinga revoluble ring means forpreventing disassociat-ion of the ring from its support and meanslocking the ring in its various adjusted positions.

2. In a grinding machine the combination of a grinding wheel having aplurality of .-circumferential active faces, a tracing and dressing toolsupport adjacent the grinding wheel comprising a plate having acircumferential groove therein, a ring coaxial with the plate andoverlying the groove, shoes carried y the ring and received in thegroove to prevent disassociation of the ring from the plate, a pluralityof dressing tools carried by the ring one for each active-face of thewheel and means for locking the ring relative to the plate to positionthe dressing tools relative to their respective faces.

plate to position the dressing tools relative to their respective faces,said means comprising a spring pressed locking pawlcooperating withnotches formed in the plate.

4. The combination with a grinding machine including a grinding wheelhaving a peripherally operative surface and a work supporting tabledisposed in opposition thereto, of a tail-stock carried by the table,and a train mechanism for the grinding wheel carried y the tailstockincluding a ring rotatable about an axis substantially parallel with thetailstock having a plurality of truing de vices projecting peripherallytherefrom whereby the truing devices will be alternatively positioned inoperative relation to the grinding wheel upon rotation of the ring, thealternate tool being simultaneously shifted into a remote inoperativeposition, and means for locking the ring at selected stations to insureproper relative position of an individual truing tool with respect tothe periphery of the wheel to be opera-ted upon thereby.

In testimony whereof we aflix our signatures.

FREDERICK s. HAAS. BERNARD A. KEARNS.

3. In a grinding machine the combination of a grinding wheel having aplurality of circumferential active faces, a trueing and dressing toolsupport adj acentthe grinding wheel comprising a plate having acircumferential groove therein, a ring coaxial with the plate andoverlying the groove, shoes carried by the ring and received in thegroove to prevent disassociation of the ring from the late a pluralityof dressing tools carried by t o ring one for each active face of thewheel, and

means for locking the ring relative to the v

